groundwater reservoirs
51Everglades — is also the name of a city in Collier County, Florida.The Everglades are a subtropical wetland located in the southern portion of the U.S. state of Florida, comprising the southern half of a large watershed. The system begins near Orlando with… …
52Water crisis — For other uses, see Water crisis (disambiguation). Deforestation of the Madagascar Highland Plateau has led to extensive siltation and unstable flows of western rivers. Water crisis is a general term used to describe a situation where the… …
53sedimentary rock — Rock formed at or near the Earth s surface by the accumulation and lithification of fragments of preexisting rocks or by precipitation from solution at normal surface temperatures. Sedimentary rocks can be formed only where sediments are… …
54mineral deposit — Introduction aggregate of a mineral in an unusually high concentration. About half of the known chemical elements (chemical element) possess some metallic (metal) properties. The term metal, however, is reserved for those chemical… …
55Morris Dam — Samuel B. Morris Dam Morris Dam viewed from the unofficial overlook on State Route 39 Country United States Location Los Angeles County, California …
56Columbia River — Coordinates: 46°14′39″N 124°3′29″W / 46.24417°N 124.05806°W / 46.24417; 124.05806 …
57valley — valleylike, adj. /val ee/, n., pl. valleys. 1. an elongated depression between uplands, hills, or mountains, esp. one following the course of a stream. 2. an extensive, more or less flat, and relatively low region drained by a great river system …
58Water supply and sanitation in Saudi Arabia — differs from most other countries in three significant aspects. First, it relies almost exclusively on two sources that are absent in most other countries: desalination and fossil water. Second, given the substantial oil wealth of the country,… …
59Petroleum — For other uses, see Petroleum (disambiguation). Proven world oil reserves, 2009 …
60Darcy's law — is a phenomenologically derived constitutive equation that describes the flow of a fluid through a porous medium. The law was formulated by Henry Darcy based on the results of experiments[1] on the flow of water through beds of sand. It also… …
